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The use of geologic expression workflows for basin scale reconnaissance; a case study from the Exmouth Subbasin, north Carnarvon Basin, northwestern Australia

N. J. McArdle, D. Iacopini, M. A. KunleDare and G. S. Paton
The use of geologic expression workflows for basin scale reconnaissance; a case study from the Exmouth Subbasin, north Carnarvon Basin, northwestern Australia (in Seismic attributes, Anonymous)
Interpretation (Tulsa) (2014) 2 (1): SA163-SA177

Abstract

The focus of this study is to demonstrate how seismic attributes can be used in the interpretation workflow to rapidly obtain a high-resolution view of the geology that is imaged within a seismic data set. To demonstrate the efficacy of seismic attribute analysis to basin scale reconnaissance, we apply a workflow to seismic data sets from the Exmouth Subbasin, northwestern Australia, with the aim of determining the geologic expression of the subsurface. Of specific interest are Barrow Group Jurassic and Cretaceous fluvial and marine sediments, that were faulted during the Jurassic-Cretaceous rifting associated with the breakup of East Gondwana. Regional-scale interpretations are made to develop a tectonostratigraphic context to the investigation. Target-level analyses, focused on features of exploration interest identified using regional reconnaissance, are made to calibrate attribute response and demonstrate the effectiveness of seismic attributes for rapid evaluation of prospectivity in the initial stages of exploration. The main structural episodes are distinguished using dip and azimuth attributes, and faulting is expressed using a combination of edge attributes which are used to create fault trend lineations. We observe three main structural trends: the main northeast-southwest Jurassic-Cretaceous syn-rift primary fault orientation of 48 degrees , a secondary trend of 108 degrees , taken to represent secondary conjugate faulting and a third trend of 100 degrees interpreted as the reactivation of these faults into the postrift sediments. Stratigraphic attributes that respond to amplitude and frequency are used to create reservoir scale geobodies of faulted Macedon turbidites, which in turn are used for detailed tuning sensitivity analysis. The final part of the investigation is of the syn-rift magmatic system responsible for sills and dikes that exploit the normal fault network. These intrusive and extrusive features are important as are potential drilling hazards and can act as baffles to hydrocarbon migration.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 2
Serial Issue: 1
Title: The use of geologic expression workflows for basin scale reconnaissance; a case study from the Exmouth Subbasin, north Carnarvon Basin, northwestern Australia
Title: Seismic attributes
Affiliation: ffA, Aberdeen, United Kingdom
Pages: SA163-SA177
Published: 2014
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 31
Accession Number: 2014-105084
Categories: Applied geophysicsEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., sects., 2 tables, sketch maps
S27°00'00" - S21°00'00", E114°30'00" - E116°00'00"
Secondary Affiliation: University of Aberdeen, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201452
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